NL1009277C2 - Method and device for accurately placing relatively heavy objects on and removing heavy objects from the seabed. - Google Patents

Method and device for accurately placing relatively heavy objects on and removing heavy objects from the seabed. Download PDF

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Publication number
NL1009277C2
NL1009277C2 NL1009277A NL1009277A NL1009277C2 NL 1009277 C2 NL1009277 C2 NL 1009277C2 NL 1009277 A NL1009277 A NL 1009277A NL 1009277 A NL1009277 A NL 1009277A NL 1009277 C2 NL1009277 C2 NL 1009277C2
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NL
Netherlands
Prior art keywords
cable
vessel
piling
rov
lifting
Prior art date
Application number
NL1009277A
Other languages
Dutch (nl)
Inventor
Francois Bernard
Original Assignee
Francois Bernard
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Francois Bernard filed Critical Francois Bernard
Priority to NL1009277 priority Critical
Priority to NL1009277A priority patent/NL1009277C2/en
Application granted granted Critical
Publication of NL1009277C2 publication Critical patent/NL1009277C2/en

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Classifications

    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B19/00Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
    • E21B19/002Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables specially adapted for underwater drilling
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B63SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63BSHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B21/00Tying-up; Shifting, towing, or pushing equipment; Anchoring
    • B63B21/22Handling or lashing of anchors
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B63SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63CLAUNCHING, HAULING-OUT, OR DRY-DOCKING OF VESSELS; LIFE-SAVING IN WATER; EQUIPMENT FOR DWELLING OR WORKING UNDER WATER; MEANS FOR SALVAGING OR SEARCHING FOR UNDERWATER OBJECTS
    • B63C11/00Equipment for dwelling or working underwater; Means for searching for underwater objects
    • B63C11/34Diving chambers with mechanical link, e.g. cable, to a base
    • B63C11/36Diving chambers with mechanical link, e.g. cable, to a base of closed type
    • B63C11/42Diving chambers with mechanical link, e.g. cable, to a base of closed type with independent propulsion or direction control
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B41/00Equipment or details not covered by groups E21B15/00 - E21B40/00
    • E21B41/04Manipulators for underwater operations, e.g. temporarily connected to well heads

Description

Title: Vessel and method for accurately placing relatively heavy objects on the sea bed and for removing heavy objects from the sea bed.

The present invention relates to a vessel provided with at least first and second lifting means, the first lifting means comprising a piling cable, the end of which can be coupled to a load, and the second lifting means comprising at least one auxiliary cable.

10 Oil and gas can be extracted at sea using floating production platforms or vessels. Such exploitation of the oil and gas fields requires that many heavy objects be placed on the sea bed. These objects must also be placed on the seabed with relatively high accuracy.

15 Because of the increasing depth, it is becoming increasingly difficult to reach the desired depth. One of the problems that must be overcome is the fact that the piling cables that are used can rotate.

In the prior art, in order to achieve the required accuracy, a lifting / hoisting vessel is often used, by means of which the objects are sunk in the direction of the sea bottom, while the position of the load to be sunk is also controlled using auxiliary cables attached to one or more auxiliary vessels. The deployment of such auxiliary vessels is very expensive.

25

The object of the invention is therefore to provide an apparatus and a method for accurately positioning heavy objects on the seabed which is less expensive than the known devices and methods, and which furthermore only requires a vessel.

30

This objective is achieved because the auxiliary cable can be coupled to the piling cable or to the load and that the auxiliary cable is equipped with at least one remote-controlled vessel (Eng), using the 1009277 2 position of the load can be manipulated underwater.

It is possible for the auxiliary cable to form a second piling cable, wherein the auxiliary cable can absorb at least part of the weight of the load.

These measures make it possible that with the second piling cable the object to be covered and a part (the end thereof) of the first piling cable can be lifted. The weight that the second piling cable carries with it will be much lower than the total weight of the first piling cable and the object to be sunk. This means that the total weight and inertial forces on the part that carries the second piling cable are relatively low. The ROV can then manipulate the part of the load (for example the object together with a small part of the first piling cable) carried by the two-piling pile rope with relatively high accuracy in the desired direction. In this way it is achieved that, with the aid of relatively simple means, heavy and or large objects can be accurately positioned on the seabed from a vessel.

It is to be understood that the piling cable in this description may also include a winch operated chain, anchor chain or any other suitable line.

Furthermore, according to the invention it is possible for the remote-controlled vessel (ROV) to be included in the auxiliary cable as a load-bearing component.

20 This means that the ROV can conduct the forces on the second piling cable itself. This makes it possible to connect a part of the piling cable to both the top and the bottom of the ROV.

Furthermore, according to the invention it is possible that the auxiliary cable is a supply line (eng: 25 umbilical).

In addition, it is possible that one or more remote-controlled vessels (ROVs) are attached near the end of the first lifting means, such that a tangential force can be exerted on the piling cable during use.

The feed line enables the supply from the vessel to the ROV. For example, the ROV 30 (or several ROVs) can also be mounted on the first piling cable. By placing the ROVs or the drive devices incorporated therein on either side of the first piling cable, a torsional force can be applied to the cable, by means of which the twisting of the cable can be prevented.

1009277 3

The invention furthermore relates to a method for placing an object on the bottom of the sea, from a vessel, in which the object is moved or lowered in the direction of the seabed by means of a first piling cable, 5 exerts a force on the object or on the first cable, near the lower end thereof, by means of a second piling cable, and - using a remote-controlled vessel (ROV) secured in the vicinity of the object and preferably to the second piling cable ) manipulates the position of the object.

10

It is possible that - the first piling cable is unfolded so far that it comes to lie at least partly on the sea bottom, - the object and a part of the first lifting cable is lifted or held from the bottom by means of the second piling cable, and - the position of the object is manipulated using the remote-controlled vessel (ROV).

Moreover, according to the invention it is possible for the remote-controlled vessel (ROV) to be fixed in such a way that a tangential force can be exerted on the first piling cable by means of the remote-controlled vessel (ROV).

The invention will be explained in more detail below with reference to a number of figures, in which:

Figure 1 shows a schematic overview of a floating production platform, for the offshore extraction of oil or gas.

Figure 2 shows a lifting vessel according to the prior art and a load, which is connected to the vessel with a relatively long cable.

Figure 3 shows a lifting vessel according to the prior art and a load, which is also attached to that vessel by means of a piling cable and is also connected to a second vessel by means of an auxiliary cable.

Figure 4 shows a lifting vessel according to the present invention, and a load connected to the vessel with both a piling cable and an auxiliary cable.

i

Figure 5 shows the lifting vessel according to Figure 3, with the aid of which a heavy object is placed on the bottom of the sea.

Figure 6 shows a lifting vessel in which the piling cable is provided with an anti-twist device.

Figure 1 shows schematically the layout for the extraction of oil or gas at sea. From a floating production platform or vessel 1, with the derrick on it; 11, pipes 2 run to a well 3, at the bottom of the sea 4. During the production of oil or gas, it is important that the vessel 1 remains fixed in place. The vessel 1 is therefore connected to the seabed with the help of cables 5, the so-called 'mooring legs'. These mooring legs are fixed in the seabed 4 using anchors 6.

20

The extraction of oil or gas according to figure 1, with the aid of a production vessel 1, requires that many relatively heavy objects be positioned on the sea bed 4 with relatively great accuracy.

In order to achieve a good and safe anchoring using the mooring 25 legs, for example, it is required that the length of these cables 5 is almost the same. In practice, anchors of 50 tons and more are used for this application, which must be placed on the seabed with an accuracy of sometimes only a few meters. In addition, the anchor 6 itself is heavy, but the cable 5 attached to the anchor 6 often still weighs a multiple thereof.

30 Also for other objects such as the templates, gravity riser bases, production manifolds and the like, these must be placed on the seabed with relatively high accuracy.

1009277 5

The objects that have to be placed on the seabed for the way of exploiting oil and gas at sea, which are shown in figure 1, are often very expensive in addition to heavy. For example, the top of the well 3 is usually closed using a Blow Out Preventer (B.O.P.) (not shown). Such a B.O.P. 5 must be placed on the ground with an accuracy of sometimes less than half a meter.

Figure 2 shows a vessel 20, according to the prior art, with lifting means thereon, such as a crane 21. The crane 21 is equipped with a piling cable 22, with the aid of which 10 an object or a load 4 on the bottom 5 of the sea can be placed. Since the piling cable 22 and the load 4 are subject to influences such as the flow of the sea water, it will become that the load will not move perpendicularly when the piling cable 22 is pulled out. The swell of the vessel, the rolling of the vessel and the like will also have a negative influence on the accuracy to be achieved. In addition, the longer the piling cable will be, the greater the deviation from the intended position (shown in dotted lines).

Figure 3 shows a solution according to the prior art to be able to exercise more control over the position of the load 23, when the piling cable 22 is unfolded. The load is moreover connected for this purpose with an auxiliary cable 31 which is operated from an auxiliary vessel 31. In addition, the load 23 can be connected to the vessel 20 with a second auxiliary cable 32.

It is clear that the load 23 can be placed on the seabed with more control by the chosen solution according to figure 3. However, it will also be clear that the solution is very expensive by deploying the auxiliary vessel 30.

Figure 4 shows a lifting vessel 40 according to the present invention. The vessel 40 comprises first lifting means, for instance a winch 41, to which a first piling cable, for instance an anchor chain 42, is connected. With the aid of this piling cable 42 a load, for instance an anchor 43, can be placed on the bottom of the sea.

The vessel 40 further comprises second lifting means, for instance a second winch 44, provided with a second piling cable 45. The second piling cable is guided overboard with the aid of an A-frame, for example. The second lifting means 44 and the second 9 2 7 7 6 piling cable 45 will generally be lighter than the first lifting means 41 and the first piling cable 42 respectively. In use, certainly in the case of an anchor chain 42 with attached chain an anchor 43, most of the weight thrown overboard will be the weight of the anchor chain 42 itself. Therefore, the major part of the pulling force will be supplied by the first piling means 41 and the first piling cable 42. However, the piling cable 45 can take up part of the weight of the load 43.

As can be seen in figure 4, the second piling cable 45 is additionally provided with a Remote Operable Vehicle (ROV) 70. A possible embodiment variant is discussed below with reference to figure 7. An ROV 70 is operated remotely and comprises drive means such as screws, jet propulsion or other suitable propulsion means. The ROV 70 is usually connected to the vessel 40 by means of a so-called supply line or umbilical 46. This umbilical 46 can be clamped on the piling cable 45 or can be separately lifted out from a third winch 47. The umbilical includes the electrical wires for the energy supply of the ROV 70. In the ROV 70, means are usually available to convert the electrical energy into hydraulic pressure. The hydraulic pressure is then used to control, among other things, the drive means.

20

The position of the load can be manipulated using the ROV 70. Since the weight of the piling cable, for example the anchor chain 42, is carried by the first lifting means 41 and only a relatively small weight is carried by the second piling cable 45, the freedom of movement of the ROV 70 is relatively great. This means that, in spite of the great weight of both the piling cable 42 together with the weight of the load 43, this load 43 can be brought to the destination with relatively high accuracy.

The combination of a second piling cable 45 and an ROV 70 allows tasks such as the laying of an anchor to be performed with high accuracy by much smaller vessels than currently used in the prior art.

As mentioned, figure 4 shows the case that an anchor 43 with an anchor chain 42 attached thereto. For example, an anchor chain known in the art has a weight of 250 kg per meter. When such a chain 2000 is celebrated with §r, the total chain has a weight of not less than 500 tons. When an anchor of, for example, 75 tons is attached to the chain, the weight of the anchor is only a fraction of the total weight of the anchor and the chain together.

In figure 5 the advantages of the present invention can be seen even more clearly, for instance in the case that an anchor 43 is placed on the seabed. In the vicinity of the destination, so much anchor chain 42 is released that the chain comes to rest on the bottom 4 of the sea. The anchor 43, with a small length of anchor chain attached thereto, is then lifted. The anchor can then be brought to its destination using the ROV 70. The length of the anchor chain from the anchor to the seabed 4 determines the radius 15 of the working area where the anchor 43 can be placed.

Figure 6 shows the vessel according to the present invention, next a further embodiment. In this case, use is made of an ROV 70, and a second ROV 71. Instead of the second ROV, a double ROV can also be used or an auxiliary ROV can be added to the ROV. The ROVs 70, 71 are placed (for example clamped on the block at the bottom of the lifting cable) so that a tangential force can be exerted on the piling cable 42. This means that the ROVs or their drive means are located on either side of the lifting cable 42 . As a result, a torsional force can be exerted on the lifting cable 42 in both directions, as desired. In this way, the ROVs have formed an anti-twist device.

To improve the anti-twist effect, the distance between the ROV or ROVs and the lifting cable can be increased. This can be done, for example, by placing the ROV (s) on telescopic arms.

30

Since working at ever greater depths, it is an increasing problem in the prior art that the long piling cables 42 can rotate or twist. Because heavy loads are attached to the underside of the piling ropes, twisting * 09277 δ with great friction can cause serious damage to the piling ropes. This wear can be so severe that the piling cable 42 breaks and the load 43 is lost. Another problem is that due to the huge twist in the cables, the cables on the vessel can run out of the cable pulleys.

5 The use of ROVs 70, 71 can be used to combat disputes.

It is clear that the ROV configuration according to figure 6 can also be combined with the second auxiliary line according to figures 4 and 5, and that in such an embodiment the advantages of both embodiments can be combined.

Figure 7 shows a possible embodiment of an ROV 70. The ROV comprises an outer frame 72 and an inner frame (not shown). The inner frame preferably has the shape of a cylinder. By connecting the outer frame to the inner frame, a very strong construction can be formed. The strength is necessary since the ROV will usually be used at great depth.

The ROV is for instance made of steel or high-strength steel and is preferably designed so strong that the ROV can be included as a load-bearing part in the second piling cable 45. This means that the top of the ROV 70 is connected to a part of the piling cable 45, and that the bottom of the ROV 70 is either connected to a part of the piling cable 45 or is directly connected to the load. The tensile load on the piling cable is thus guided by the ROV 70. As mentioned, the ROV 70 includes means for converting the flow supplied by the umbilical 46 into hydraulic pressure.

An additional advantage of the device and the method according to the present invention is that it reduces the risks of placing the heavy objects.

Another important advantage is that the preliminary design of a number of required parts can be carried out more accurately. Because there is more certainty in advance about achieving the required accuracy.

30

The above description always refers in particular to the placing of objects on the seabed. It is to be understood that the invention can also be advantageously applied for lifting or lifting objects from the sea bed.

r 1009277

Claims (8)

1. Vessel provided with at least first and second lifting means, wherein the first lifting means comprise a piling cable, the end of which can be coupled to a load, and wherein the second lifting means comprise at least one auxiliary cable, characterized in that the auxiliary cable can be coupled on the pile-driving cable or on the load and that the auxiliary cable is equipped with at least one remote-controlled vessel (ROV), by means of which the position of the load can be manipulated underwater.
2. A vessel according to claim 1, characterized in that the auxiliary cable forms a second lifting cable, wherein the auxiliary cable can absorb at least a part of the weight of the load.
Vessel according to claim 2, characterized in that the remote-controlled vessel (ROV) is included in the auxiliary cable as a load-bearing component.
Vessel according to any of the preceding claims, characterized in that the auxiliary cable is a power line (eng: umbilical). 20
A vessel according to any one of the preceding claims, characterized in that one or more ROVs are mounted near the end of the first lifting means, such that a tangential force can be exerted on the lifting cable during use. 25
6. Method for placing an object on the bottom of the sea, from a vessel, whereby - the object is moved or lowered in the direction of the seabed with the aid of a first lifting cable, 30. with the aid of a second lifting cable exerts a force on the object or on the first cable, near the lower end thereof, and - the position of the position is secured by means of a remote-controlled vessel (ROV) mounted in the vicinity of the object and preferably on the second lifting cable from the ? j 0 9 2 7 7 manipulates object.
A method according to claim 6, wherein - the first piling cable is unfolded so far that it comes to lie at least partly on the seabed, - the object and a part of the first piling cable are removed from the bottom with the aid of the second piling cable lifted or held up, and - the position of the object is manipulated using the remote controlled vessel (ROV). 10
Method as claimed in claim 6 or 7, wherein - the remote-controlled vessel (ROV) is attached such that a tangential force can be exerted on the first piling cable by means of the remote-controlled vessel (ROV). 15 1009277
NL1009277A 1998-05-28 1998-05-28 Method and device for accurately placing relatively heavy objects on and removing heavy objects from the seabed. NL1009277C2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
NL1009277 1998-05-28
NL1009277A NL1009277C2 (en) 1998-05-28 1998-05-28 Method and device for accurately placing relatively heavy objects on and removing heavy objects from the seabed.

Applications Claiming Priority (17)

Application Number Priority Date Filing Date Title
NL1009277A NL1009277C2 (en) 1998-05-28 1998-05-28 Method and device for accurately placing relatively heavy objects on and removing heavy objects from the seabed.
CN 99806724 CN1121965C (en) 1998-05-28 1999-04-26 Apparatus and method for deploying object or load on seabed
RU2000133216A RU2201374C2 (en) 1998-05-28 1999-04-26 Device and method for deploying object or cargo on sea bottom
DE1999615616 DE69915616T2 (en) 1998-05-28 1999-04-26 Apparatus and method for settling an object or a load on the seabed
BR9910745A BR9910745A (en) 1998-05-28 1999-04-26 Apparatus and process for extending an object or cargo over the seabed, from a ship
CA 2333311 CA2333311C (en) 1998-05-28 1999-04-26 Apparatus and method for deploying an object or a load on the seabed
AU34463/99A AU3446399A (en) 1998-05-28 1999-04-26 Apparatus and method for deploying an object or a load on the seabed
DK99916089T DK1080006T3 (en) 1998-05-28 1999-04-26 Apparatus and method for laying an object or weight on the seabed
ES99916089T ES2214022T3 (en) 1998-05-28 1999-04-26 Apparatus and method for displaying objects or loads in the sea fund.
US09/701,171 US6588985B1 (en) 1998-05-28 1999-04-26 Apparatus and method for deploying an object or a load on a seabed
JP2000550731A JP3574071B2 (en) 1998-05-28 1999-04-26 Apparatus and method for deploying an object or load to a seabed
PCT/NL1999/000242 WO1999061307A1 (en) 1998-05-28 1999-04-26 Apparatus and method for deploying an object or a load on the seabed
AP200001989A AP200001989A0 (en) 1998-05-28 1999-04-26 Apparatus and method for deploying an object or a load on the seabed
IDW20002388A ID26636A (en) 1998-05-28 1999-04-26 Equipment and method for distributing objects or loads on the seabed
EP19990916089 EP1080006B1 (en) 1998-05-28 1999-04-26 Apparatus and method for deploying an object or a load on the seabed
AT99916089T AT261841T (en) 1998-05-28 1999-04-26 Device and method for depositing an object or a load on the sea bottom
NO20005872A NO325043B1 (en) 1998-05-28 2000-11-21 The process feed and apparatus for placing the objects on the seabed

Publications (1)

Publication Number Publication Date
NL1009277C2 true NL1009277C2 (en) 1999-11-30

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Family Applications (1)

Application Number Title Priority Date Filing Date
NL1009277A NL1009277C2 (en) 1998-05-28 1998-05-28 Method and device for accurately placing relatively heavy objects on and removing heavy objects from the seabed.

Country Status (17)

Country Link
US (1) US6588985B1 (en)
EP (1) EP1080006B1 (en)
JP (1) JP3574071B2 (en)
CN (1) CN1121965C (en)
AP (1) AP200001989A0 (en)
AT (1) AT261841T (en)
AU (1) AU3446399A (en)
BR (1) BR9910745A (en)
CA (1) CA2333311C (en)
DE (1) DE69915616T2 (en)
DK (1) DK1080006T3 (en)
ES (1) ES2214022T3 (en)
ID (1) ID26636A (en)
NL (1) NL1009277C2 (en)
NO (1) NO325043B1 (en)
RU (1) RU2201374C2 (en)
WO (1) WO1999061307A1 (en)

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DE69915616T2 (en) 2005-03-03
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CN1121965C (en) 2003-09-24
CN1303341A (en) 2001-07-11
NO325043B1 (en) 2008-01-21
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US6588985B1 (en) 2003-07-08
EP1080006B1 (en) 2004-03-17
BR9910745A (en) 2001-02-13

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